Police in Chicago were warned not to cooperate with the Department of Homeland Security (DHS) on issues of immigration.

The Chicago Police Department (CPD)sent a memo, obtained by Fox News, to officers in late September telling them to wait for a supervisor to arrive before assisting DHS. Upon arrival, the supervisor will direct CPD officers to leave the scene, “if the request is to assist with an immigration arrest or detention. Fox News confirmed the authenticity of the memo but could not determine whether Chicago Mayor Lori Lightfoot was behind the directive.

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Several sources within the CPD told Fox that the new policy puts both departments at risk.

“See what happens when that happens and a DHS agent is injured because of a lack of response by CPD. Sickening what’s happening here,” one source told the outlet.

“You’ll not find a single real police officer that would refuse to assist another agency,” said another.